Astudent used a yardstick to model elastic rebound. the student bent the stick without breaking it and then let the stock go. what does the bent stick represent in the student's model?

a. the rock's original shape

b. a siesmic wave

c. the rock's deformed shape

d. a fault formed

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)